# Excel表列名称
给你一个整数 columnNumber ，返回它在 Excel 表中相对应的列名称。
例如：
A -> 1
B -> 2
C -> 3
...
Z -> 26
AA -> 27
AB -> 28
...
示例 1：
输入：columnNumber = 1
输出："A"
示例 2：
输入：columnNumber = 28
输出："AB"
示例 3：
输入：columnNumber = 701
输出："ZY"
示例 4：
输入：columnNumber = 2147483647
输出："FXSHRXW"
提示：
1 <= columnNumber <= 231 - 1
## template
```python
class Solution(object):
def convertToTitle(self, n):
"""
:type n: int
:rtype: str
"""
d = {}
r = []
a = ""
for i in range(1, 27):
d[i] = chr(64 + i)
if n <= 26:
return d[n]
if n % 26 == 0:
n = n / 26 - 1
a = "Z"
while n > 26:
s = n % 26
n = n // 26
r.append(s)
result = d[n]
for i in r[::-1]:
result += d[i]
return result + a
```
## 答案
```python
```
## 选项
### A
```python
```
### B
```python
```
### C
```python
```